Oh Brooke, I can relate on the pram issue. My main pram is a childcare trio & toddler seat. fantastic for keeping everyone in one place but its big & bulky. Not to mention Heavy. I am managing still but I have trouble with pushing it when both boys are in it. the pram would be at least 10 or 12 kg (at a wild guess) but the boys together add another 30kg to the weight. On flat rides its ok, but that hill I need to walk back up to get home when I go for walks is a killer now.
I take the just the stroller for Glenn if DH is with me but if I am on my own I take the big one as Evan often wants to be picked up or needs to be picked up to get him to stay with you.
I don't mind paying more for the car seats if it will work. But I know DH will roll his eyes at me. But mind you also, he was hoping we could make it "work" till at least the begining of the year when we will have a clear picture of what his work will be like. I pointed out that we wont have a clear cut picture of that time next July!